Sentences with phrase «background warming signal»

Not exact matches

The point at which a trend becomes clear within the average temperature data for a given region — known as the «time of emergence» — depends on when the source of the warming begins, how fast it happens and the amount of background «noise» obscuring the signal.

«This signal of warming emerged above the noise of background variability during the 20th century for most parts of the globe.

The hockey stick provides compelling evidence for the emergence of a human - caused warming signal from the background noise of natural fluctuations in climate.

While many studies of the effects of global warming on hurricanes predict an increase in various metrics of Atlantic basin - wide activity, it is less clear that this signal will emerge from background noise in measures of hurricane damage, which depend largely on rare, high - intensity landfalling events and are thus highly volatile compared to basin - wide storm metrics.

«The interdependence of continental warm cloud properties derived from unexploited solar background signals in ground - based lidar measurements.»

Against such a noisy background, it is hard to detect the signal from any changes caused by humanity's increased economic activity, and consequent release of atmosphere - warming greenhouse gases such as carbon dioxide.

There are, however, caveats: (1) multidecadal fluctuations in Arctic — subarctic climate and sea ice appear most pronounced in the Atlantic sector, such that the pan-Arctic signal may be substantially smaller [e.g., Polyakov et al., 2003; Mahajan et al., 2011]; (2) the sea - ice records synthesized here represent primarily the cold season (winter — spring), whereas the satellite record clearly shows losses primarily in summer, suggesting that other processes and feedback are important; (3) observations show that while recent sea - ice losses in winter are most pronounced in the Greenland and Barents Seas, the largest reductions in summer are remote from the Atlantic, e.g., Beaufort, Chukchi, and Siberian seas (National Snow and Ice Data Center, 2012, http://nsidc.org/Arcticseaicenews/); and (4) the recent reductions in sea ice should not be considered merely the latest in a sequence of AMOrelated multidecadal fluctuations but rather the first one to be superposed upon an anthropogenic GHG warming background signal that is emerging strongly in the Arctic [Kaufmann et al., 2009; Serreze et al., 2009].

Raising the costs of 7.5 billion people's food, energy and fuel in order to maybe slow down warming by less than.1 C / decade seems like a very risky thing to do to me, and I want to see 60 to 120 years more data to really tease out the human signal from the background natural variability signal.

Or does the background trend in Figure 3 represent the global warming «forced» signal of an ever - increasing sea ice loss, plus natural variability (Bitz)?

When a PIR sensor detects sufficient movement of these warm «objects» and / or a significant temperature differential between the object and the background scene, it signals the camera to start recording and send an alert to the user.